pia mater

详细解释:【医】 软脑[脊]膜

英语解释：

名词 pia mater:

the highly vascular innermost of the 3 meninges

例句：

A network of extremely small blood vessels passing between the pia mater and the cerebral cortex.大脑绒被从软膜和大脑皮层之间穿过的极细的小血管形成的网